All of AlongSepDoits are always invoked if provided.
AlongStepDoIts are invoked in the phase G4SteppingManger is transporting a particle by one step. Each change to the track information is recorded and accumulated in G4Step. However, track information themselves (data members G4Track) are not modified.
After all AlongStepDoIt's are invoked, G4Track data members will be updated by referring to G4Step.
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